Spirit-level



(No Model.)

H. N. JASPER@ SPRIT LEVEL.

Patented Jan. 25, 1887.l

Patins. Phouvmmgmmr. wunmy Hlllnrren S'rnfrns Peint tries@ HENRY N. JASPER, OF AKRON, OHIO.

eineN-LEVEL.

SPECIFIGATIGN forming p'axt of Letters Patent No;356,645, dated January 25, 1887,

' Application filed April (i, 1886. Serial No. 197,971,

To (zZ-5 wiz-om it 72mg concern:

'Be it known that I, HENRY N. JASPER, e citizen of the United States, residing et Akron, in the county of Summit und State of Ohio, have invented certain neu7 und useful Improvements in Spirit-Levels, of which the following is e specification.

My invention relates to that class of leveling-instruments known us spirit-levelsf" and my invention consists in combining with the holder for the spirit un messing-tube, which protects it from injury, and in supporting one or both tubes upon elastic bearings, to prevent the breaking of the tubes from the jarring of the instrument, und in combining with the tube or tubes s permanent leveling-marl; und un adjustable index, all as set forth hereinafter, and us illustrated in the accompanying drawings, in Which- Fignre l is u side elevation of a leveling-instrumentillustrating my improvements. Fig. :l is u section showing the arrangement of the tubes und their bearings, und Fig. 3 o section showing u inodiiieution.

As ordinarily constructed, the tubular holders of spirit-levels are very opt to be broken by sudden blows either upon thevitreous holders themselves or upon the frame or bur of the level, against which the holders have positive bearings. Itis also common to set the holders in u. frame in suoli nmnuer that the levels of the bolder may be altered for the purpose of testing` or building feces at angles to the perpendicular or horizon; but it is difficult with the instruments as ordinarily constructed to determine accurately the position of the bubble, :is the index or finger, when onee moved to indicate the position of the bubble when the feces ure at un angle, cannot always be placed with certainty in position to indioate the place of the bubble when the faces are horizontal or vertical.

In my improved leveling-instrument I make use of the ordinary gloss holder, A, slightly curved, as usunhsud portiallyiilled with spirit, and inelose this holder in un outside straight tu be, B, of heavy gless-suolnfor instance, es the tube used in steam-gages; and I support the inner tube Within the outer tube by means of end bearings or blocks, C C, of wood, rubber, or other materiel of s si miler character, in such (No model.)

man ner that the inner tube will have no direct Contact with the outer one.

The outer tube Iseeure intheordinsrynlnnner to the ring-frame or other support of the leveling-instrument, in Sonie instances interposing u bend or strip, o, of rubber or equivalent material, so as to prevent u direct contact of the tube B with the freine. The incesingtube B, owing to its superiorstrength, will resist blows which would dest-roy the holdertube; but should the outer tube be broken the inner tube will still be preserved, owing to the intermediate space und the absence of Contact between the tu bes. By supporting the tubeeither the inner tube or the messing-tube, or both-upon a. bearing material which is somewhat elastic-ns Wood, rubber, compressed felt, te-shocks und jars are absorbed und prevented from being transmitted to the tubes, so that heavy blows or the jarring; of the frame will have no effect either to fracture the tube or tubes or to displace them, or either of thenze mark or index-point, fr, to indicate the position of the bubble when the instrument is bsolutely level, und I prefer to put this niark upon the inner tube or holder, so that it eennot be'ta-lnpered with or be displaced, the integrity of the instrument being thus innintoined; and'for the purposes of indicating the position of the bubblein trying isees which are at ou angle I use an adjustable pointer or indicator, which may be e ring, b, sliding upon the outer tube and easily moved by hond, es shown in Figs. l und 2; or it may be e bund sliding upon the outer tube and oerrying e pointer, D, as shown in Fig. 3.

It will be evident that the arrangement 'of parts above described may be used in connection with leveling instruments of-different forms, und that the tubes muy be inserted directly in the body of the material composing the instrument, or muy be secured to adjust- Itble rings or immesse in levels in common use.

lVithout limiting myself to the precise eonstructiou und arrangement oi' ports shown, I

elaiui l l. The combination of the trunspurent holder A of u spirit-level und etrunsperent iueasingtube, B, substantially as and for the. purpose set forthL IOC 2. The Combination 0f the Spirit-holder A,

transparent incasing-tube B, and end bearings supporting the spirit-holder concentric 'with but free from contact with the incasing-tube, substantially as described.

3. The combi nation of the transparent spiritholder A, transparent incasing-tube B, and interposed elastic bearings for the holder, as andv for the purpose set forth.

4. The combination, with the frame of a levcling-instrument, ofa glass tube holding a body` of spirit and a heavier glass tube inciosing the spirit-holder, and elastic bearings interposed.y between saidholder and tube and maintaining them free from contact with each other, substantially as and for the purpose described'.4

5. The combination,fn ia, levelinginstrument, of a spirit-holder having anindicating-` mark fixed thereon, a transparent tube incios- HENRY N; JASPERL? Witnesses: I

G. R. MERRIMAN, f ALFRED G. W'ILsoN. 

